QWebEngineView update with pdf path

Question

我正在QtWebEngineWidgets展示一些 pdf 文件。我想更改 pdf 并强制QtWebEngineView自动动态显示。我遇到的问题是QtWebEngineWidgetspdf 文件路径更改时无法更新、无法显示。

class PdfReport(QtWebEngineWidgets.QWebEngineView):
    PDFJS = 'file:///pdfjs/web/viewer.html'
    def __init__(self, parent=None):
        super(PdfReport, self).__init__(parent)
        self.PDF = 'file:///Technicalreport/file0.pdf'
        self.load(QtCore.QUrl.fromUserInput('%s?file=%s' % (PDFJS, self.PDF))) 

    @QtCore.pyqtSlot(int)    
    def index_load(self, _index):
        self._index = _index
        self.PDF = pdfpath(self._index)

外部函数：

def pdfpath(index):
    if index == -1:
        PDF = 'file:///Technicalreport/file0.pdf'
    else:
        PDF = 'file:///Technicalreport/file%d.pdf' %index
    return PDF

尝试测试函数并按预期返回：

for i in range(3):
    print(pdfpath(i), type(pdfpath(i)))

file:///Technicalreport/file0.pdf <class 'str'>
file:///Technicalreport/file1.pdf <class 'str'>
file:///Technicalreport/file2.pdf <class 'str'>

是的 pdf 文件'file0'，'file1'并且'file2'存在：

运行时出现此错误：

TypeError: 'module' object is not callable

更新：

import sys
from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets

PDFJS = 'file:///pdfjs/web/viewer.html'
PDF = 'file:///Technicalreport/file0.pdf'

def pdfpath(index):
    if index == -1:
        PDF = 'file:///Technicalreport/file0.pdf'
    else:
        PDF = 'file:///Technicalreport/file%d.pdf' %index
    return PDF


class Foo(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Foo, self).__init__(parent)
        self.setGeometry(QtCore.QRect(200, 100, 800, 800))

        self.pdf = Window()
        self.com = Widget()
        self.lay = QtWidgets.QVBoxLayout(self)
        self.lay.addWidget(self.pdf)
        self.lay.addWidget(self.com)

        self.com.IndexChanged.connect(self.pdf.index_load)


class Window(QtWebEngineWidgets.QWebEngineView):

    def __init__(self, parent=None):
        super(Window, self).__init__(parent)
        self.PDF = PDF
        self.load(QtCore.QUrl.fromUserInput('%s?file=%s' % (PDFJS, self.PDF)))            

    @QtCore.pyqtSlot(int)    
    def index_load(self, _index):
        self._index = _index
        self.PDF = pdfpath(self._index)
        print(self.PDF,'=', self._index)



class Widget(QtWidgets.QWidget):
    IndexChanged = QtCore.pyqtSignal(int)
    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.setLayout(QtWidgets.QVBoxLayout())
        self.combo = QtWidgets.QComboBox(self)
        self.layout().addWidget(self.combo)
        self.combo.addItems(["item1", "item2", "item3"])
        self.combo.setMinimumWidth(150)
        self.combo.activated[int].connect(self.onActivatedIndex)

    @QtCore.pyqtSlot(int)
    def onActivatedIndex(self, index):
        self.IndexChanged.emit(index)


if __name__ == '__main__':

    app = QtWidgets.QApplication(sys.argv)
    window = Foo()
    window.setGeometry(600, 50, 800, 600)
    window.show()
    sys.exit(app.exec_())

展示：

Answer 1

假设程序的其他部分工作正常，问题是您只更新了变量，但没有加载新的 url，因此解决方案是：

\n\n

class PdfReport(QtWebEngineWidgets.QWebEngineView):\n    PDFJS = "file:///pdfjs/web/viewer.html"\n\n    def __init__(self, parent=None):\n        super(PdfReport, self).__init__(parent)\n        self.load_pdf("file:///Technicalreport/file0.pdf")\n\n    def load_pdf(self, pdf):\n        self.load(\n            QtCore.QUrl.fromUserInput("%s?file=%s" % (PdfReport.PDFJS, pdf))\n        )\n

\n\n

您的情况的问题是您错误地创建了路径，因为您必须使用绝对路径，而不是像您的情况那样使用相对路径。考虑到上述情况，解决方案是：

\n\n

import os\nimport sys\nfrom PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets\n\nCURRENT_DIR = os.path.dirname(os.path.realpath(__file__))\n\nPDFJS = QtCore.QUrl.fromLocalFile(\n    os.path.join(CURRENT_DIR, "pdfjs/web/viewer.html")\n).toString()\n\n\ndef pdfpath(index):\n    filename = ""\n    if index == -1:\n        filename = "Technicalreport/file0.pdf"\n    else:\n        filename = "Technicalreport/file%d.pdf" % index\n    return os.path.join(CURRENT_DIR, filename)\n\n\nclass PdfReport(QtWebEngineWidgets.QWebEngineView):\n    def load_pdf(self, filename):\n        url = QtCore.QUrl.fromLocalFile(filename).toString()\n        self.load(QtCore.QUrl.fromUserInput("%s?file=%s" % (PDFJS, url)))\n\n    def sizeHint(self):\n        return QtCore.QSize(640, 480)\n\n    @QtCore.pyqtSlot(int)\n    def index_load(self, index):\n        path = pdfpath(index)\n        self.load_pdf(path)\n\n\nclass Widget(QtWidgets.QWidget):\n    indexChanged = QtCore.pyqtSignal(int)\n\n    def __init__(self, parent=None):\n        super(Widget, self).__init__(parent)\n        self.combo = QtWidgets.QComboBox()\n        self.combo.addItems(["item1", "item2", "item3"])\n        self.combo.setMinimumWidth(150)\n        self.combo.activated[int].connect(self.indexChanged)\n\n        lay = QtWidgets.QVBoxLayout(self)\n        lay.addWidget(self.combo)\n\n        self.setSizePolicy(\n            QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Maximum\n        )\n\n\nclass Foo(QtWidgets.QWidget):\n    def __init__(self, parent=None):\n        super(Foo, self).__init__(parent)\n\n        self.pdf = PdfReport()\n        self.com = Widget()\n\n        self.com.indexChanged.connect(self.pdf.index_load)\n        self.pdf.index_load(-1)\n\n        lay = QtWidgets.QVBoxLayout(self)\n        lay.addWidget(self.pdf)\n        lay.addWidget(self.com)\n\n\nif __name__ == "__main__":\n\n    app = QtWidgets.QApplication(sys.argv)\n    w = Foo()\n    w.show()\n    sys.exit(app.exec_())\n

\n\n

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